Genesis Hydra

Synergies

 * will not only damage opposing troops but yours as well giving Hydra a +1/+1 boost.

Other

 * When you deal 1 damage to it, the permanent +1 will offset the damage, while Genesis Hydra also gains the permanent +1.

Rulings

 * If Genesis Hydra is dealt exactly fatal damage, it will be destroyed before its triggered power resolves.